With Rain Gauge you can check at any time of the day how much it's going to rain on your specific location in the next 3 hours! Rain Gauge is also able to give you the current weather, and the forecasts for the upcoming and with the awesome rain-radar you're able to see what's coming up!
Live tiles & rain alerts
Heck, you don't even have to open Rain Gauge! Setup rain alerts to get a message once it's going to rain, and check the live tile for the rain graph